<template>
  <div class="container">
    <div class="row">
      <div class="col-12 pt-3">
        <table class="table table-bordered">
          <thead>
            <tr>
              <th scope="col">编号</th>
              <th scope="col">科目</th>
              <th scope="col">成绩</th>
              <th scope="col">考试时间</th>
              <th scope="col">操作</th>
            </tr>
          </thead>
          <tbody v-if="list.length !== 0">
            <tr v-for="(item, index) in list" :key="item.id">
              <th scope="row">{{ index + 1 }}</th>
              <td>{{ item.subject }}</td>
              <td :class="{ 'not-pass': item.score < 60 }">{{ item.score }}</td>
              <td>{{ item.time }}</td>
              <td>
                <!-- 1. 绑定事件， 传参index -->
                <button
                  @click="deyByIndex(index)"
                  type="button"
                  class="btn btn-link"
                >
                  删除
                </button>
              </td>
            </tr>

            <tr class="bg-light">
              <th scope="row">统计</th>
              <td colspan="2">总分：0</td>
              <td colspan="2">平均分：0</td>
            </tr>
          </tbody>
          <tfoot v-else>
            <tr>
              <td class="text-center" colspan="5">暂无数据</td>
            </tr>
          </tfoot>
        </table>
      </div>
    </div>

    <form class="row align-items-center">
      <div class="col-3">
        <input type="text" class="form-control" placeholder="请输入科目" />
      </div>

      <div class="col-3">
        <input type="text" class="form-control" placeholder="请输入分数" />
      </div>

      <div class="col-3">
        <button type="submit" class="btn btn-primary">添加</button>
      </div>
    </form>
  </div>
</template>

<script>
export default {
  name: "App",
  data() {
    return {
      list: [
        {
          id: 100,
          subject: "语文",
          score: 99,
          time: new Date("2010-08-12"),
        },
        {
          id: 101,
          subject: "数学",
          score: 34,
          time: new Date("2020-09-01"),
        },
        {
          id: 102,
          subject: "英语",
          score: 25,
          time: new Date("2018-11-22"),
        },
        {
          id: 103,
          subject: "体育",
          score: 100,
          time: new Date("2020-12-12"),
        },
      ],
    };
  },

  methods: {
    // 2.定义methods
    deyByIndex(index) {
      // 3. 使用splice删除一条数据
      console.log("index  ----->  ", index);
      this.list.splice(index, 1);
    },
  },
};
</script>

<style>
.not-pass {
  color: red;
}
</style>
